摘要
用营养液培养的方法,研究不同铁营养状况对黄瓜幼苗吸收和转运镉、锌的影响。结果表明:不供铁处理的黄瓜不同部位(根、茎、叶)镉含量与供铁处理差异显著,以茎中最为明显,茎中镉含量分别是供铁50、100、200μmol·L-1处理的2.9、2.8、2.4倍,不供铁处理显著增加了黄瓜各部位镉的含量;不供铁处理也显著提高了黄瓜根和叶片中锌的含量,但对茎中锌的含量没有产生显著影响。黄瓜根系吸收镉和锌的总量与吸收铁的总量表现出显著的负相关关系。随着铁供应浓度的升高,镉在根中的分配增加,与缺铁相比,供铁200μmol·L-1处理根中分配系数上升43%,而茎、叶中分别下降59%和44%,其对锌的分配则无显著影响。与供铁相比,不供铁明显促进黄瓜根、茎、叶对镉的吸收,提高镉在黄瓜地上部的分配及由根向茎转运镉的能力。
Plant nutrition may influence the uptake of heavy metals by plants. In this study, the effects of different iron(Fe) supply on the uptake and translocation of cadmium(Cd) and zinc(Zn) by cucumber seedlings were studied in nutrient solution. Cadmium concentrations in different parts(root, stem and leaf) of cucumber seedlings were significantly higher under iron deficiency than iron sufficiency, especially in stems. The concentrations of Cd in stems under Fe deficiency were 2.9, 2.8 and 2.4 times those of 50, 100 and 200 μmol·L-1iron supply,respectively. Meanwhile, Fe-deficient treatment also increased the Zn concentrations in roots and leaves, but did not influence the Zn concentrations in stems. The uptake of Cd and Zn by roots showed significantly negative correlation with Fe uptake. The percentages of Cd allocated in roots increased with increasing Fe levels in nutrition solution. Compared with the Fe-deficient treatment, 200 μmol·L-1Fe treatment increased the distribution of Cd in root by 43%, but decreased that in stems and leaves by 59% and 44%, respectively. However, Fe treatments had no significant effects on Zn distribution in plant. The results indicate that Fe-deficiency increases the uptake, transport and distribution of Cd by cucumber seedlings.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2015年第3期409-414,共6页
Journal of Agro-Environment Science
基金
国家自然科学基金(41471271)
关键词
铁营养
黄瓜
镉
锌
iron nutrition
cucumber
cadmium
zinc
